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public static String encodeBase64(byte[] b) {    String Base64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";    ByteArrayOutputStream os = new ByteArrayOutputStream();    for (int i = 0; i < (b.length + 2) / 3; i++) {        short[] s = new short[3];        short[] t = new short[4];        for (int j = 0; j < 3; j++) {            if ((i * 3 + j) < b.length)                s[j] = (short) (b[i * 3 + j] & 0xFF);            else                s[j] = -1;        }        t[0] = (short) (s[0] >> 2);        if (s[1] == -1)            t[1] = (short) (((s[0] & 0x3) << 4));        else            t[1] = (short) (((s[0] & 0x3) << 4) + (s[1] >> 4));        if (s[1] == -1)            t[2] = t[3] = 64;        else if (s[2] == -1) {            t[2] = (short) (((s[1] & 0xF) << 2));            t[3] = 64;        } else {            t[2] = (short) (((s[1] & 0xF) << 2) + (s[2] >> 6));            t[3] = (short) (s[2] & 0x3F);        }        for (int j = 0; j < 4; j++)            os.write(Base64.charAt(t[j]));    }    return new String(os.toByteArray());}